Theodobe hofstatteb



(No Model.)

T. HOFSTATTE'R, Jr.

BORING MACHINE.

Pate nted Sept. 11, 1883.

a e s s e n Warm Hq am 3m b a mxa/mm llNrrEn STATES THEODORE HOESTATTER,JR, OF NEW YORK, N. Y.

BORING-MACHINE.

SPECIFICATION forming- .part of Letters Patent No. 284,850, datedSeptember 11, 1883.

Application filed June 2, 18513. (No model.)

To all whom it mag concern.-

Be it known that I, THEODORE HOFSTAT TER, Jr., a resident of the city,county, and State of New York, have invented a new and usefulImprovement in Boring-Machines; and I do hereby declare that thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, making a part of this specification.

My invention relates to an improved attachment for boring-machines, andhas for its object to provide an adjustable stop-gage and guide whichshall limit the penetration of the auger, and at the same time supportand center it as the piece to be bored is pushed and pressed against it.

It consists in a collar adapted to closely encircle the auger orboring-tool, and yet allow its free rotation therein, secured upon a baradapted to slide longitudinally in the frame of the machine parallelwith the auger, and to be fixed by a set-screw, and which is graduatedto an exact scale on one edge to facilitate a nice adjustment of thegage to determine any required depth of bore.

In the accompanying drawings, Figure 1 is a side elevation of a simpleboring-machine having my improvement combined therewith; Fig. 2, a planview-of the same, and Fig. 3 a detached sectional'view of thegage-collar with the auger led through the same.

A represents the base, B B the pillow-bloeks, and C the rotating shaft,of a simple boringmachine. The boring-shaft O, fitted at its outer endwith a chuck, D, carrying an auger, E, is made'to rotate in stationaryboxes upon the pillow-blocks, the power being applied, as usual, to apulley, F, on the shaft. A longitudinally-sliding bar, G, is supportedin line parallel with the shaft 0 in suitable bearings formed for thepurpose in the pillow-blocks B B, and is carried through a box, H,secured to one of the blocks, and made fast therein, when adjustedlongitudinally, by means of a set-screw, J, led through the side of thebox. The outer end of the bar G projects in line with the auger, and isbent at a right angle to approach the same. (See Fig. 1.) Upon this endis formed or fitted an annular gage or collar, K, adapted to so encirclethe bit or anger E as to support and guide the same, without, however,impeding or affecting its free rotation. A properly graduated scale, L,is

marked upon the bar G,'to facilitate setting the gage K'at any desireddistance from the end of the auger and indicate the depth of itspenetration as limited by the stop-gage.

In use, the gage K, being set at the'proper point to permit apenetration of the auger to 6:) the required depth in the work to beexecuted, is thereupon fixed by means of the setscrew J. The workbrought up and fed against the auger in the customary manner willnecessarily be arrested by the gage so soon as the hole bored by theauger has reached the determined depth. By this means any number ofholes may be rapidly bored upon the machine to exactly the same depth,this depth being varied at pleasure by a longitudinal adjustment of thebar, and measured and accurately indicated by reference to the graduatedscale L, marked thereon.

It is evident that the gagestop K need not completely encircle theanger, but, may be 7 5 made in the form of a fork or U-shaped. Icontemplate also causing the gage to traverse longitudinally along thelength of the auger in suitable supporting-ways by means of an endlessscrew rotating parallel with the auger and made to engage'a nut fixed inthe gage.

I claim as my invention 1. In a boring-machine, the combination, withits rotating boring-shaft and with a bit or an auger carried thereby, ofa stop-gage 8 5 adapted to traverse longitudinally for adjustment inline parallel with said shaft, and to embrace the bit or auger to limitthe depth of its penetration, substantially in the manner and for thepurpose herein set forth.

2. The combination, with a rotating boringshaft, 0, of the parallellongitudinally-sliding bar G, the gage K, carried upon the end of saidbar and adapted to embrace the auger E, fitted to the boring-shaft, theset-screw J, adapted to 9 5 lock the bar when adjusted, and the scale L,marked upon the bar to indicate the position of the gage with referenceto the end of the auger, all substantially in the manner and for thepurpose herein set forth.

In testimony whereof Ihave signed my name to this specification in thepresence of two subscribing witnesses.

THEODORE HOFSTATTER, JR.

Witnesses:

A. W. STIEGER, G. H. SPENCER.

